Adam criticizes Juliet's reading selection, saying that Ben wouldn't even read it in the bathroom.
In contrast, Ben previously intimated to Locke in Maternity Leave that he likes Stephen King, specifically preferring his books to those of Dostoyevsky. This may have been a bit of ironic humor on Ben's part, since the Book Club had been reading a Stephen King novel immediately before witnessing the plane crash, and Ben was interrogated by the Survivors 58 days later.
Adam's criticism that Ben would disapprove of Juliet's selection indicates either that Ben is the regular host of the Book Club, or has some personal connection with Juliet such as roommate, boyfriend, husband or brother.
This may show Adam's and the rest of the Others' reverence for Ben, and Juliet's displeasure with how Ben runs things (also apparent in the subtext of the final exchange between the two as Juliet leaves the observation room for Jack's cell).
Adam and Juliet's discussion about Juliet's book choice could be a subtle commentary on Lost itself. During the dialogue, Juliet says; "Here I am, thinking free will still actually exist on-"
The book Carrie is potentially an allusion to Juliet's character. Perhaps she perceives herself as an outcast, like Carrie, and will get her revenge by assisting or joining the Lostaways.
The art on the wall looks similar to that in the Staff station.
The man sitting next to the older woman looks vaguely similar to the policeman who released Jack from jail at the end of "A Tale of Two Cities."